gh-95233: Correct grp.getgrgid parameter name in documentation (gid -> id) (gh-95232)

(cherry picked from commit df7c8b95)

Co-authored-by: Adam Dangoor <adamdangoor@gmail.com>

Doc/library/grp.rst

@@ -38,7 +38,7 @@ accessible via :func:`getgrnam` or :func:`getgrgid`.)
 It defines the following items:
 
 
-.. function:: getgrgid(gid)
+.. function:: getgrgid(id)
 
    Return the group database entry for the given numeric group ID. :exc:`KeyError`
    is raised if the entry asked for cannot be found.